Make fID and MixedID calculations private

src/core/SkDraw.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDraw.h"
 #include "SkBlitter.h"
 #include "SkCanvas.h"
@@ skipping 1516 matching lines @@
 }
 
 SkDraw1Glyph::Proc SkDraw1Glyph::init(const SkDraw* draw, SkBlitter* blitter, SkGlyphCache* cache,
                                       const SkPaint& pnt) {
     fDraw = draw;
     fBlitter = blitter;
     fCache = cache;
     fPaint = &pnt;
 
     if (cache->isSubpixel()) {
-        fHalfSampleX = fHalfSampleY = (SK_FixedHalf >> SkGlyph::kSubBits);
+        fHalfSampleX = fHalfSampleY = SkGlyph::kSubpixelRound;
     } else {
         fHalfSampleX = fHalfSampleY = SK_FixedHalf;
     }
 
     if (hasCustomD1GProc(*draw)) {
         // todo: fix this assumption about clips w/ custom
         fClip = draw->fClip;
         fClipBounds = fClip->getBounds();
         return draw->fProcs->fD1GProc;
     }
@@ skipping 846 matching lines @@
         mask->fImage = SkMask::AllocImage(size);
         memset(mask->fImage, 0, mask->computeImageSize());
     }
 
     if (SkMask::kJustComputeBounds_CreateMode != mode) {
         draw_into_mask(*mask, devPath, style);
     }
 
     return true;
 }